Preparation and Properties of Sulphur Dioxide Video Lecture - NEET

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let's talk about the sulphur dioxide all
it is an important compounds of the blue
sixteen elements the sulphur dioxide is
formed actually when the sulfur is
bonded oxygen II we just see this
reaction sulphur dioxide
there's a colorless gas with the pungent
spin you will study about easier though
looks like this form are given in sulfur
is burned in oxygen in the lab we can
actually prepare the sulfur dioxide by
treating sulfide with dilute sulfuric
acid is all fine I can treat with any
acid I'll get some products but in
industry we use better way what we do we
have something called roasting of
sulphide ores we have seen in the last
chapter so the roasting of sulphide ore
actually has so2 as the by-product
example at yes - I had roasted to make
oxide then you will see that we will get
alpha dioxide as a by-product so in the
last scale we don't use the lab wait
whether it's costly we use the roasting
method anyway roasting is used to purify
or to extract metals from the sulfide
ores so in that case so - is a
by-product if we talk about the property
of sulphur dioxide it is again a
colorless gas but it has a pungent smell
has very bad smell
it is highly water soluble if you see
sulphur dioxide will immediately react
with water to form sulfur us as
and it is typically gas but you can
liquefy it even if the room temperature
but for that you have to give the
pressure of 2 ATM okay and if you want
to boil it you need a temperature of 263
3 ok so you see what was Oliver and
water it reaction form sulfuric acid
this sulfur dioxide will also react with
sodium hydroxide to form sodium sulfide
okay and if you give more and more
sulfur dioxide it forms sodium hydrogen
sulfide as with the reaction I have
sodium hydroxide to react the sulfur
dioxide to form any to so3 and some
water molecule now this na to so3 filled
again react with some water and again
some more sulphate I said you give any
edge so3 this is sodium hydrogen sulfide
and this is my sodium sulfide okay and
this so2 also react with chlorine in the
presence of some charcoal that will be
used as a catalyst it will form micelle
free chloride socl2 this so2 can be
oxidized actually in the presence of
manna diem oxide catalyst so yeah so -
you can oxidize to so3 but for this you
need some catalyst mana named oxide
catalyst this so2 when moist moist so2
that means with some water
hey this is moist yes - it acts as a
reducing agent example example this
reacts with the ferric oxide or a very
kind it will become
it is reduced and the reaction will be
so4 - - and some of us okay if you want
to see the shape shape of this so2 it is
like this - the resonance is like this
yes this is an angular in shape so that
thought we have the property of sulfur
dioxide let's see some of the uses of
sulfur dioxide it is used for the
petroleum refining like refining it is
used it is used for sugar refinery also
it is used for the bleaching bleaching
of wool and silk is used or disinfectant
this is my disinfectant it is also used
for the preservatives it is used to
manufacture sub-query acid it is also
used as a solvent as a solvent to
dissolve both my organic and chemicals
so once again petroleum refining sugar
refining used for bleaching disinfectant
used for preservatives used to be clear
sulfuric acid if sigma numerical Don no
sulfur dioxide what happens when sulfur
dioxide is path to acquisition of ethics
we have seen that the moist sulfur
dioxide acts as reducing agent pride
only the moist moist as a pro is mine
reducing again
is ourselves reaction so I have a key
free plus with access solution on this
dioxide is passed so what becomes plus
and minus ok comment on the nature of s
will bond to form when the so two
molecules are these two bonds equal yes
then the resonance at leas or the
structure of so2 this was the structure
the levy starts to actually get on your
own and this is in resonance
so this is the structure actually if you
want try to combine structure you can
draw something like this right so this
length is actually 143 become a trend
this angle is 109.5 d yes they let the
same how is the presence of so2 detected
we just discuss this Ashley so the ping
came in a 4 will turn colorless I am in
a four - this pink it will done
colorless so you can see the reaction
for this
I have ki M you know this is pink in
color you react with sulphur dioxide and
some water solvent you get a - oh four
plus k2so4 plus h 2 s oh and this is
colorless and this is another test is my
if you take acidified
k2cr2o7 this will turn green if the
stern green that means so2 is there
example can the reaction be k2cr2o7 this
is orange and this react with sulphur
dioxide water and solvent is acidified
so at the h2 so4 XD and then you get
k2so4 and CR get support 3 and some
water molecule the spot is green so from
orange to green there's so many other
tests expect iodine
I would like this I already knows violet
in color when I already in reacts with
Maggie and sulphur and water as my
solvent you get h2so4 and thi and this
is all colorless there's so many tests
actually you can take fecl3 ferric
chloride which is yellow in color the
last reaction we just saw 3 plus they
can take fecl3 it becomes ever easier to
this first chloride and this is green ok
the assumed you tests we can do detect
the sun
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